CN110406381A - Power battery precharge switch device based on IGBT module - Google Patents
Power battery precharge switch device based on IGBT module Download PDFInfo
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- CN110406381A CN110406381A CN201910821215.2A CN201910821215A CN110406381A CN 110406381 A CN110406381 A CN 110406381A CN 201910821215 A CN201910821215 A CN 201910821215A CN 110406381 A CN110406381 A CN 110406381A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a kind of power battery precharge switch device based on IGBT module, for controlling the on-off of the precharge branch of power battery, it includes low pressure accessory power supply, microcontroller, low-voltage control circuit, isolating switch power, gate drive circuit and IGBT module；Wherein, the IGBT module is connected in precharge branch；The low pressure accessory power supply is connected by low-voltage control circuit with the isolating switch power, is suitable for providing low-tension supply to the isolating switch power；The microcontroller is connected with the low-voltage control circuit, is suitable for controlling the low-voltage control circuit on-off；The isolating switch power is connected with the gate drive circuit；The gate drive circuit is connected with the IGBT module.The present invention uses IGBT module as switch is executed, and can enhance the real-time of precharge switch movement, also reduces the requirement to microcontroller driving capability, and with good electromagnetic compatibility characteristic, also has miniaturization and cost effective equal exploitation advantages.
Description
Technical field
The present invention relates to a kind of power battery precharge switch device based on IGBT module.
Background technique
With the continuous development of new energy science and technology, the use of electric car is more and more common.Within orthodox car
The characteristics of combustion engine acting is power source is different, and electric car is using motor acting as its power source.And motor running work
One electrifying startup stage of experience is required before making, there are many large capacitors since motor input terminals have, in order to effective
Ground inhibits the transient current of motor power up phase, enhances the electrical safety characteristic of energy-storage system, needs to power on motor
Cheng Jinhang is effectively managed, and most common management-control method is pre-charge method.This method refers in motor power up phase first
By one precharge branch comprising current-limiting resistance of closure and until motor input terminals voltage is slowly promoted to preset electricity
Pressure value, then the precharge branch is disconnected, and major loop is connected, motor pre-charge process is completed and enters normal work at this time
Make state.Pre-charge process is the stage that each motor electrifying startup is subjected to, therefore can it effectively run work
The stability and safety for making to run electric car have a major impact.
It is to execute precharge branch on off operating mode using high-voltage relay to switch in conventional method, although high-voltage relay
There is good pressure-resistant insulation characterisitic when device disconnection, but still have the real-times such as response speed is slow, execution action delay is long
The disadvantage of difference；High-voltage relay execution switch motion energy consumption is higher, and most controllers output electric currents are smaller, can not directly drive
Dynamic high-voltage relay executes switch motion, it is also necessary to additional to increase auxiliary circuit to enhance its driving capability；High-voltage relay simultaneously
Device switching process is easy to produce stronger electromagnetic interference, and Electro Magnetic Compatibility is poor；The volume of high-voltage relay is big and at high price, answers
When for part apparatus such as the battery breaking units of electric car and block terminals, it is unfavorable for realizing the small-sized of these electric devices
Change and cost effective improvement.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, provide a kind of dynamic based on IGBT module
Power battery pre-charging switching device, it uses IGBT module as switch is executed, and can enhance the real-time of precharge switch movement
Property, it also reduces the requirement to microcontroller driving capability, and there is good electromagnetic compatibility characteristic, also there is miniaturization and low
The exploitation advantages such as cost.
In order to solve the above-mentioned technical problem, the technical scheme is that a kind of power battery based on IGBT module is pre-
Charging switchgear, the on-off of the precharge branch for controlling power battery, it include low pressure accessory power supply, microcontroller,
Low-voltage control circuit, isolating switch power, gate drive circuit and IGBT module；Wherein,
The IGBT module is connected in precharge branch；
The low pressure accessory power supply is connected by low-voltage control circuit with the isolating switch power, is suitable for the disconnecting switch
Power supply provides low-tension supply；
The microcontroller is connected with the low-voltage control circuit, is suitable for controlling the low-voltage control circuit on-off；
The isolating switch power is connected with the gate drive circuit, suitable for low-tension supply is converted to high voltage power supply with to door
Pole drive circuitry；
The gate drive circuit is connected with the IGBT module, suitable for high voltage power supply is converted to driving signal to drive IGBT
Module is connected so that precharge branch is in the conductive state.
Further, the microcontroller controls low-voltage control circuit on-off based on the digital signal level of its output.
A kind of specific structure of low-voltage control circuit is further provided, the low-voltage control circuit includes:
Metal-oxide-semiconductor Q1 is connected between low pressure accessory power supply and isolating switch power, suitable for the low pressure for exporting low pressure accessory power supply
Power supply is delivered to disconnecting switch element；
Triode Q2 is connected between microcontroller and metal-oxide-semiconductor Q1, and the control signal suitable for exporting microcontroller carries out electric current
Amplification and signal inversion are converted to control the closure or shutdown of metal-oxide-semiconductor Q1.
Further, the metal-oxide-semiconductor Q1 is enhanced P-channel metal-oxide-semiconductor Q1, and source electrode s is connected to low pressure accessory power supply anode,
Its d that drains is connected to isolated power supply switch input terminal, and the low pressure accessory power supply negative terminal is connected to power ground GND；
The triode Q2 is NPN type triode Q2, and base stage b is exported by the control signal that resistance R3 is connected to microcontroller
End, collector c are connected by resistance R2 with the grid g of the metal-oxide-semiconductor Q1, and emitter e is connected to power ground GND.
Further for the stabilization of the driving voltage between the grid g and source electrode s for keeping metal-oxide-semiconductor Q1, the low voltage control
Circuit further includes resistance R1 and diode D1, resistance R1 and diode D1 be connected in parallel on respectively metal-oxide-semiconductor Q1 grid g and source electrode s it
Between, wherein the anode of the zener diode D1 is connected with the grid g of metal-oxide-semiconductor, the cathode and MOS of the zener diode D1
The source electrode s of pipe is connected；
And/or in order to guarantee that, when low-voltage control circuit is in original state, triode Q2 is in off state, the low pressure control
Circuit processed further includes the resistance R4 being connected between the base stage b of triode Q2 and emitter e.
A kind of specific structure of isolating switch power is further provided, the isolating switch power includes:
Isolating transformer T1；
Transformer driver U1, feeder ear U are connected to low-voltage control circuit output end and isolating transformer T1 primary side side
Middle-end, signal end P are connected to isolating transformer T1 primary side side upper end, and signal end N is connected to isolating transformer T1 primary side side
Lower end；
Full-bridge circuit, the full-bridge circuit be the series circuit that is made of diode D2 and diode D4 with by diode D3 and two
The series circuit of pole pipe D5 composition is formed in parallel, on the tie point and isolating transformer T1 secondary side of diode D2 and diode D4
End is connected, and the tie point of diode D3 and diode D5 are connected with isolating transformer T1 secondary side lower end, diode D3 and second level
The isolator ISO_GND that the anode parallel connected end of pipe D5 is exported as isolating switch power, the cathode of diode D4 and diode D5
The power end that parallel connected end is exported as isolating switch power.
Further for improve isolating switch power transient response ability, isolating switch power output power end and every
It leaves and is parallel with capacitor C3 between the isolator ISO_GND for closing output.
A kind of specific structure of gate drive circuit is further provided, the gate drive circuit includes three pole of positive-negative-positive
Pipe Q3, TVS pipe D6, resistance R5, resistance R6 and resistance R7, the IGBT module include igbt transistor；Wherein,
The emitter e of the PNP type triode Q3 is connected to the power end of isolating switch power output, PNP type triode Q3's
Base stage b is connected to the cathode of TVS pipe D6, and the anode of the TVS pipe D6 is connected with one end of resistance R5, and the other end of resistance R5 connects
It is connected to the isolator ISO_GND of isolating switch power output, the collector c of the positive-negative-positive triode Q3 is connected by resistance R6
In the grid G of igbt transistor, the resistance R7 is connected in parallel between the grid G of igbt transistor and emitter E using as aerial drainage
Resistance.
Further provide a kind of specific structure of precharge branch, the precharge branch includes power battery and electronic
Machine load, the power battery anode are connected with the collector C of the igbt transistor, and the motor load anode passes through pre-
Charging resistance is connected with the emitter E of the igbt transistor.
After above-mentioned technical proposal, low-voltage control circuit comes pair for realizing microcontroller output digital signal level
Isolating switch power is powered control；Isolating switch power is used to low pressure accessory power supply power supply being converted to High-tension Switch Devices
The power supply of driving circuit；Gate drive circuit is used to for isolating switch power output voltage to be converted into driving IGBT module institute
The signal needed, present invention is mainly applied to the battery breaking units and block terminal of electric car, use high pressure compared to existing
Mode of the relay as precharge switch component, present invention has the advantage that
(1) present invention energy fast-response control signal, and accelerate switch motion and execute rate；
(2) transient power consumption caused by switch motion is small in the present invention, and EMI characteristic is good；
(3) control signal power very little needed for IGBT module in the present invention requires microcontroller driving capability lower；
(4) present invention has the characteristics that small in size and at low cost, adapts to the miniaturization and low cost of power battery energy storage system
The development trend of change.
Detailed description of the invention
Fig. 1 is the functional block diagram of the power battery precharge switch device of the invention based on IGBT module.
Specific embodiment
In order that the present invention can be more clearly and readily understood, right below according to specific embodiment and in conjunction with attached drawing
The present invention is described in further detail.
As shown in Figure 1, a kind of power battery precharge switch device based on IGBT module, for controlling power battery
The on-off of precharge branch, it includes low pressure accessory power supply, microcontroller, low-voltage control circuit, isolating switch power, gate pole drive
Dynamic circuit and IGBT module；Wherein,
The IGBT module is connected in precharge branch；
The low pressure accessory power supply is connected by low-voltage control circuit with the isolating switch power, is suitable for the disconnecting switch
Power supply provides low-tension supply；
The microcontroller is connected with the low-voltage control circuit, is suitable for controlling the low-voltage control circuit on-off；
The isolating switch power is connected with the gate drive circuit, suitable for low-tension supply is converted to high voltage power supply with to door
Pole drive circuitry；
The gate drive circuit is connected with the IGBT module, suitable for high voltage power supply is converted to driving signal to drive IGBT
Module is connected so that precharge branch is in the conductive state.
Specifically, the microcontroller controls low-voltage control circuit on-off based on the digital signal level of its output.
As shown in Figure 1, the low-voltage control circuit is mainly by enhanced P-channel metal-oxide-semiconductor Q1, NPN type triode Q2, two
The devices composition such as pole pipe D1, capacitor C1 and resistance R1, resistance R2, resistance R3 and resistance R4.Wherein, capacitor C1 is as decoupling electricity
Appearance is connected between low pressure accessory power supply anode and negative terminal, confession of the low pressure accessory power supply anode as entire precharge switch device
Power supply, low pressure accessory power supply negative terminal are then used as the power ground GND of entire precharge switch device；Enhanced P-channel metal-oxide-semiconductor Q1
As the execution switch element that low pressure accessory power supply is delivered to isolating switch power, source electrode s is connected to low pressure accessory power supply
Anode, drain electrode d are connected to the input terminal of isolating switch power；Resistance R1 and diode D1 are parallel to enhanced P-channel respectively
Between the source electrode s and grid g of metal-oxide-semiconductor Q1, electricity is driven between the grid g and source electrode s for keeping enhanced P-channel metal-oxide-semiconductor Q1
The stabilization of pressure prevents driving signal overtension from causing P-channel metal-oxide-semiconductor Q1 breakdown failure；NPN type triode Q2 is used for micro-control
The control signal of device output processed carries out Current amplifier and signal inversion conversion carrys out closing for the enhanced P-channel metal-oxide-semiconductor Q1 of drive control
It closes or turns off, the grid g of collector c and enhanced P-channel metal-oxide-semiconductor Q1 are connected to resistance R2, and base stage b passes through resistance
R3 is connected to the control signal output of microcontroller, and emitter e is directly connected in power ground GND；Resistance R4 is connected to NPN
Between the base stage b and emitter e of type triode Q2, NPN type three when for guaranteeing that entire low-voltage control circuit is in original state
Pole pipe Q2 is in off state.
In the present embodiment, the diode D1 is Zener diode D1.
As shown in Figure 1, the isolating switch power is mainly by transformer driver U1, isolating transformer T1, capacitor C2,
The devices such as capacitor C3 and diode D2, diode D3, diode D4 and diode D5 composition.Wherein, transformer driver U1
Feeder ear U be connected with isolating transformer T1 primary side side middle-end, and feeder ear U be also connected to low-voltage control circuit output
End, capacitor C2 are connected between feeder ear U and power ground GND, for providing decoupling effect for power input；And transformer drives
The signal end P of dynamic device U1 is connected to the upper end of isolating transformer T1 primary side side, the signal end N of transformer driver U1 be connected to every
Lower end from transformer T1 primary side side, signal end P and signal end N generate that frequency is identical and the pwm signal of opposite in phase is for driving
Power supply is carried out isolation conversion by dynamic isolating transformer T1；And diode D2, diode D3, diode D4 and diode D5 group
The power supply of primary side side is subjected to isolation conversion at full-bridge circuit cooperation isolating transformer T1, wherein diode D2 and two poles
Pipe D4 series connection it is in parallel with diode D3 and diode D5 series circuit progresss again, and the tie point of diode D2 and diode D4 and
Isolating transformer T1 secondary side upper end is connected, the tie point of diode D3 and diode D5 and isolating transformer T1 secondary side lower end
It is connected, the isolator ISO_GND that the parallel connected end of diode D2 and diode D3 anode is exported as isolating switch power, and two poles
The power end that the parallel connected end of pipe D4 and diode D5 cathode is exported as isolating switch power；Capacitor C3 be parallel to keep apart it is powered-down
Source output terminal is used as decoupling capacitor, is conducive to the transient response ability for improving isolating switch power.
In the present embodiment, the diode D2, diode D3, diode D4 and diode D5 are Zener diode.
As shown in Figure 1, the gate drive circuit is mainly by PNP type triode Q3, TVS pipe D6 and resistance R5, electricity
The devices such as R6 and resistance R7 composition is hindered, IGBT module includes igbt transistor；Wherein, resistance R6 is connected to the grid of igbt transistor
Pole G prevents the excessive damage igbt transistor of driving current with the driving current for being restricted igbt transistor；Resistance R7 is parallel to
Between the grid G and emitter E of igbt transistor, it is used as bleeder resistor, accelerates electric turn off process under igbt transistor, and can prevent
Only igbt transistor because it is electrostatic charges accumulated cause over-voltage breakdown due to fail；PNP type triode Q3 is used as isolating switch power is defeated
It send to the execution switch element of the grid G of igbt transistor, its emitter e is connected to the power supply of isolating switch power output
End, its collector c is connected to one end of igbt transistor input resistance R6, and its base stage b passes through TVS pipe D6 and resistance R5
It is connected to isolator ISO_GND；TVS pipe D6 and resistance R5 forms series circuit, reaches for monitoring triode Q3 base stage b current potential
TVS pipe D6 breakdown threshold and form base current and open triode Q3, and guide isolating switch power output voltage to drive
Igbt transistor；The other end of resistance R6 is connected with the grid G of igbt transistor.
The hardware circuit course of work of the present invention is specifically stated are as follows:
Initial phase, low pressure accessory power supply exports supply voltage, but the control signal of microcontroller output is in low level shape
State, triode Q2 is in an off state without base current, and the grid g and source electrode s of metal-oxide-semiconductor Q1 is in high level state, grid
Source voltage difference very little causes metal-oxide-semiconductor Q1 to be also at off state, and isolating switch power is then in shutdown status without voltage input,
And igbt transistor does not have that driving signal is then in an off state, so that precharge branch is in an off state；
Low-voltage control circuit power up phase, low pressure accessory power supply export supply voltage, and the control signal of microcontroller output
High level state is become from low level, triode Q2 obtains base current in opening state, and the source electrode s of metal-oxide-semiconductor Q1 is still protected
Hold high level and grid g because negative electrical charge injection is in low level state, metal-oxide-semiconductor Q1 is on because gate source voltage increases at this time
State, thus low pressure accessory power supply output voltage is transported to isolating switch power, and isolating switch power starting voltage is converted
Process；
Isolating switch power working stage, transformer driver U1 start to work, and signal end P and signal N generate identical frequency
And the pwm signal of opposite in phase；When signal end P is high level, then signal end N is low level, and power supply exports electric current at this time
From isolating transformer T1 primary side side, middle-end flows to lower end, and is mutated electromotive force and isolating transformer T1 secondary side is made to start output electricity
Stream, and diode D4 and diode D3 conducting, capacitor C3 in full-bridge circuit are started to charge；When signal end P be low level, then
Signal end N is high level, and power supply exports electric current and flows to upper end from isolating transformer T1 primary side side middle-end at this time, and is mutated electricity
Kinetic potential makes isolating transformer T1 continue to output electric current, and makes diode D5 and diode D2 conducting, capacitor in full-bridge circuit
C3 continues to charge；And as capacitor C3 constantly charges, output voltage starts to be gradually increasing so that reach setting voltage value and it is steady
It decides；
Driving signal power up phase, when isolating switch power gradually starts, when the base stage b current potential of PNP type triode Q3 starts
The breakdown threshold of TVS pipe D6 is unable to reach in low value, so that PNP type triode Q3 is in off state；And keep apart powered-down
Source output voltage gradually rises, and collector c and base stage the b current potential of PNP type triode Q3 also all increases, when three pole of positive-negative-positive
When the base stage b current potential of pipe Q3 is increased to the breakdown threshold of TVS pipe D6, breakdown takes place and short-circuit, positive-negative-positive at this time in TVS pipe D6
The base stage b current potential of triode Q3 takes place decline and forms base current, therefore PNP type triode Q3 is begun to turn on, it is clear that
Isolating switch power output voltage has risen to the peak of setting voltage and settles out at this time, and PNP type triode Q3
Isolating switch power output voltage is guided to drive igbt transistor after conducting rapidly；Then, igbt transistor, which gradually becomes, leads
Logical state, precharge branch are in closed state；
In the electric stage under driving signal, low pressure accessory power supply exports supply voltage, and the control signal of microcontroller output is by height
Level becomes low level state, and the base current of NPN type triode Q2 disappears and in an off state, and the source electrode s of metal-oxide-semiconductor Q1 is still
Keep high level and grid g because negative electrical charge is taken away in high level state, metal-oxide-semiconductor Q1 is in pass because gate source voltage reduces at this time
Disconnected state, thus low pressure accessory power supply is cut off isolating switch power supply path, and isolating switch power stops working；With
Isolating switch power shut down, the base stage b current potential of PNP type triode Q3 starts to gradually decrease and be unable to reach hitting for TVS pipe D6
Wear threshold value；TVS pipe D6 starts to restore off-state and can not provide PNP type triode Q3 conducting required base current at this time,
PNP type triode Q3 is initially located in off state, is cut off to the path of igbt transistor feed drive signal, igbt transistor
Grid G and emitter E between voltage signal begin through resistance R7 electric discharge and be reduced to zero；Final igbt transistor starts to close
It is disconnected also to cause precharge branch in an off state.
Particular embodiments described above, pair present invention solves the technical problem that, technical scheme and beneficial effects carry out
It is further described, it should be understood that the above is only a specific embodiment of the present invention, is not limited to this
Invention, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this hair
Within bright protection scope.
In the description of the present invention, it is to be understood that, indicating position or the term of positional relationship are based on shown in attached drawing
Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than the equipment of indication or suggestion meaning
Or element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, or be somebody's turn to do
Invention product using when the orientation or positional relationship usually put, be merely for convenience of description of the present invention and simplification of the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore not
It can be interpreted as limitation of the present invention.In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, and cannot manage
Solution is indication or suggestion relative importance.
In addition, the terms such as term "horizontal", "vertical", " pendency " are not offered as requiring component abswolute level or pendency, and
It is that can be slightly tilted.It is not to indicate the structure if "horizontal" only refers to that its direction is more horizontal with respect to for "vertical"
It has to fully horizontally, but can be slightly tilted.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be on or below second feature
Directly contacted including the first and second features, also may include the first and second features be not direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above include fisrt feature second spy
Right above sign and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature second feature it
Under, lower section and fisrt feature included below be directly below and diagonally below the second feature, or be merely representative of first feature horizontal height
Less than second feature.
Claims (9)
1. a kind of power battery precharge switch device based on IGBT module, for controlling the precharge branch of power battery
On-off, which is characterized in that it includes low pressure accessory power supply, microcontroller, low-voltage control circuit, isolating switch power, gate pole drive
Dynamic circuit and IGBT module；Wherein,
The IGBT module is connected in precharge branch；
The low pressure accessory power supply is connected by low-voltage control circuit with the isolating switch power, is suitable for the disconnecting switch
Power supply provides low-tension supply；
The microcontroller is connected with the low-voltage control circuit, is suitable for controlling the low-voltage control circuit on-off；
The isolating switch power is connected with the gate drive circuit, suitable for low-tension supply is converted to high voltage power supply with to door
Pole drive circuitry；
The gate drive circuit is connected with the IGBT module, suitable for high voltage power supply is converted to driving signal to drive IGBT
Module is connected so that precharge branch is in the conductive state.
2. the power battery precharge switch device according to claim 1 based on IGBT module, which is characterized in that described
Microcontroller controls low-voltage control circuit on-off based on the digital signal level of its output.
3. the power battery precharge switch device according to claim 2 based on IGBT module, which is characterized in that described
Low-voltage control circuit includes:
Metal-oxide-semiconductor Q1 is connected between low pressure accessory power supply and isolating switch power, suitable for the low pressure for exporting low pressure accessory power supply
Power supply is delivered to disconnecting switch element；
Triode Q2 is connected between microcontroller and metal-oxide-semiconductor Q1, and the control signal suitable for exporting microcontroller carries out electric current
Amplification and signal inversion are converted to control the closure or shutdown of metal-oxide-semiconductor Q1.
4. the power battery precharge switch device according to claim 3 based on IGBT module, which is characterized in that described
Metal-oxide-semiconductor Q1 is enhanced P-channel metal-oxide-semiconductor Q1, and source electrode s is connected to low pressure accessory power supply anode, and drain electrode d is connected to isolation electricity
Source switch input terminal, the low pressure accessory power supply negative terminal are connected to power ground GND；
The triode Q2 is NPN type triode Q2, and base stage b is exported by the control signal that resistance R3 is connected to microcontroller
End, collector c are connected by resistance R2 with the grid g of the metal-oxide-semiconductor Q1, and emitter e is connected to power ground GND.
5. the power battery precharge switch device according to claim 4 based on IGBT module, which is characterized in that described
Low-voltage control circuit further includes resistance R1 and diode D1, resistance R1 and diode D1 be connected in parallel on respectively metal-oxide-semiconductor Q1 grid g and
Between source electrode s, wherein the anode of the zener diode D1 is connected with the grid g of metal-oxide-semiconductor, the yin of the zener diode D1
Pole is connected with the source electrode s of metal-oxide-semiconductor；
And/or the low-voltage control circuit further includes the resistance R4 being connected between the base stage b of triode Q2 and emitter e.
6. the power battery precharge switch device according to claim 1 based on IGBT module, which is characterized in that described
Isolating switch power includes:
Isolating transformer T1；
Transformer driver U1, feeder ear U are connected to low-voltage control circuit output end and isolating transformer T1 primary side side
Middle-end, signal end P are connected to isolating transformer T1 primary side side upper end, and signal end N is connected to isolating transformer T1 primary side side
Lower end；
Full-bridge circuit, the full-bridge circuit be the series circuit that is made of diode D2 and diode D4 with by diode D3 and two
The series circuit of pole pipe D5 composition is formed in parallel, on the tie point and isolating transformer T1 secondary side of diode D2 and diode D4
End is connected, and the tie point of diode D3 and diode D5 are connected with isolating transformer T1 secondary side lower end, diode D3 and second level
The isolator ISO_GND that the anode parallel connected end of pipe D5 is exported as isolating switch power, the cathode of diode D4 and diode D5
The power end that parallel connected end is exported as isolating switch power.
7. the power battery precharge switch device according to claim 6 based on IGBT module, which is characterized in that isolation
Capacitor C3 is parallel between the power end of Switching Power Supply output and the isolator ISO_GND of disconnecting switch output.
8. the power battery precharge switch device according to claim 6 based on IGBT module, which is characterized in that described
Gate drive circuit includes that PNP type triode Q3, TVS pipe D6, resistance R5, resistance R6 and resistance R7, the IGBT module include
Igbt transistor；Wherein,
The emitter e of the PNP type triode Q3 is connected to the power end of isolating switch power output, PNP type triode Q3's
Base stage b is connected to the cathode of TVS pipe D6, and the anode of the TVS pipe D6 is connected with one end of resistance R5, and the other end of resistance R5 connects
It is connected to the isolator ISO_GND of isolating switch power output, the collector c of the positive-negative-positive triode Q3 is connected by resistance R6
In the grid G of igbt transistor, the resistance R7 is connected in parallel between the grid G of igbt transistor and emitter E using as aerial drainage
Resistance.
9. the power battery precharge switch device according to claim 8 based on IGBT module, which is characterized in that described
Precharge branch includes power battery and motor load, the collector C of the power battery anode and the igbt transistor
It is connected, the motor load anode is connected by preliminary filling resistance with the emitter E of the igbt transistor.
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